折流板液滴分离的OpenFOAM模拟及验证

OpenFOAM Simulation and Verification of Droplet Separation in Baffles

为预测折流板中的气液两相流行为,使用OpenFOAM基于Euler-Lagrangian方法以液滴为离散相、气流为连续相模拟了折流板中离散相与连续相双向耦合的流动。其中离散相受曳力作用,连续相分别使用了标准k-ε模型与k-ωSST模型进行模拟。本文介绍了网格的划分,对于OpenFOAM生成的Lagrangian粒子坐标的后处理以及基于OpenFOAM编写的折流板汽水分离效率程序。计算得到不同湍流模型在不同网格下的连续相流场、连续相速度场以及汽水分离效率与实验数据的对比。结果表明,无论是连续相还是离散相,湍流模型相较于网格对于结果的影响更大,k-ωSST模型计算结果更加准确,模型对于大尺寸直径的液滴分离效率预测准确,但是对于小直径液滴的分离效率预测不够准确。

In order to predict the gas-liquid two-phase flow behavior in a baffle,OpenFOAM based Euler-Lagrangian method was used to simulate the two-way coupling flow of discrete and continuous phases in a baffle,with liquid droplets as the discrete phase and gas flow as the continuous phase.The discrete phase is subject to the drag force,and the continuous phase is simulated using the standard k-εmodel and the standard k-ωSST model respectively.This article introduces grid meshing,post-processing of Lagrangian particle coordinates generated by OpenFOAM,and a program based on OpenFOAM for baffle steam water separation efficiency.The continuous-phase flow field,continuous-phase velocity field and steam water separation efficiency of different turbulence models under different grids are calculated and compared with the experimental data.The results show that the turbulence model has a greater impact on the results than the grid,whether it is continuous phase or discrete phase,and the calculation results of k-ωSST model are more accurate.The model can predict the separation efficiency of large diameter droplets accurately,but cannot predict the separation efficiency of small diameter droplets accurately enough.